Bucket trip for steam excavators



D. DE SANTO.

BUCKET TRIP FOR STEAM EXCAVATORS.

APPLICATION FILED AUG. I, 1921.

Patntea. Nov. 7, 1922i.

IAQSIQ.

Patented Nov. 7, T922.

UNET-E@ STATES PATENT '@FFCE.,

DAVID DE SANTOfOF NEW ROCHELLE, NEW YORK, ASSIGNOR TO -THE WILKES-CASEY IENGNEERING AND CONTRACTING COMPANY INCORPORATED, OF NEW ROCHELLE, NEW YORK, A CORPORATION 0F NEW YORK.

BUCKET TRIP FOR STEAM EXCAVTORS.

Application filed August 1, 1921. Seria1-No. 488,74.

To aZZ whom t may concern: A

Be it known that I, DAVID DE SANTO, a citizen of the United States, residing in the city of New Rochelle, in the State of New York, have invented certain new and useful Improvements in BucketV Trips for Steam Excavators, of which the following is a specification, reference being had to the accompanying drawing, forming a part In the ordinary use of steam shovels or excavators rapid operation requires the servloes of atspecial man to trip the bucket or scoop when it is in position to discharge its load. For this purpose a rope is run from the trip, over suitable guides, to some convenient point where it can be grasped by the hands, a sharp pull being required for the release of the trip. At this time the hands of the engineer are usually otherwise engaged and much time is lostif he is required to shift hishands to the trip rope.

Itis the object of this'invention to provide means whereby the trip rope is operated automatically, the operating means being brought into action at the proper time by the application of one foot of the engineer to a pedal, without requiring him to remove his hands from the controlling levers. In accordance with the invention the trip rope,

- connected to the trip and led over suitable guides as usual, is arranged so. that it is drawn out during the outward movement of the bucket or scoop and is held under such tension that there shall beno slack, the tension., however, being insuicient to trip the bucket. Means are provided whereby the drawing out of the trip rope can bestopped at any time, whereby the continued outward movement of the bucket, under its own momentum or by the outhaul cable, will b cause a sharp pull to be placed on the trip rope, sufficient to release the trip. Thisl action is brought about by the engineer just before the bucket reaches ,the poir'4 of discharge, having then a further movement of a few inches which is suiiicientto effect the release of the trip. The invention 4will be more fully explained hereinafter with reference to the accompanying drawing in which it is illustrated and in which- Figure 1 is a View mainly in side elevatio'n of an --excavator to which the invention is applied.` i

.Figures 2 and 3 are detail 'views of parts to be referred to.

In the drawing there is shown only so much of an excavator of ordinary construction as is necessary to enable the invention to be understoodhand these' parts may be of any usual or suitable construction. As shown in the drawing the excavator is pro- .vided with -a boom a: pivoted, as at o, to the framev c of the excavator, so that the boom can be raised and lowered and swung to one side or the other as required in the operation of the excavator. `The bucket or scoop d has its bottom d hinged in the usual manner and provided, as at d2, with a trip which normally holds the bottom in closed position but can be disengaged by av sharp pull so as to release the bottom and permit the load to be discharged. The bucket or scoop is hung from the boom by a suitable trolley (la, so `that it can be moved readily upon the boom, either in or out, by the usual means under the control of the engineer. As shown, an outhaul cable e, connected to the bucket d, passes over a guide sheave at the outer end of the boom a and thence, over other suitable guide sheaves, to a drum e operated from .the engine under the control of the engineer in the usual manner. A hoisting cable f, connected at one end to the frame o,

the usual manner, for the purpose of raising and lowering the boom.

The engineer stands .upon a` foot board or licor c2, facing to the front, with his hands in position: on the controlling levers. The trip rope g, connected to the trip d2 of the ucket or scoop d,v is drawn out by the outward movement of the bucket or scoop and is arranged to be taken up by suitable means such as the means hereinafter described. On or near the foot board c2, in position convenient for operation by the foot of the engineer, is placed a device whereby the outward movement of the trip rope, under the infiuiY ce of the bucket, can be checked at any time and thereby suflicient tension be placed on the trip rope, by the continued outward movement ofthe bucket or scoop, even for a few inches only, to cause the release of the trip.

20 drum h in a direction towind thereon the Various forms of devices for taking up the slack of the trip rope and for checking its outward movement might be devised, but

4the devices shown in the drawing are found able guide sheave 2 and'connected to the" frame as at 3, receives, in the bight ,between the guide sheave and the point of connection 3, a counterweight i4, carried by a sheave 5. The take-up rope 1s always under. tension, by reason .of the counterweight, and therefore tends to rotate the trip rope g, which is led over a guide sheave q and thence to the trip d2. The trip rope g Vis therefore maintained always under tension, but the tension is insuflicient to `release the trip. The trip rope is drawn out by the outward movement of the bucket and, when the bucket moves inward,I is rewound again on thedrum h. As a convenient device for checking the outward movement of the trip rope,'so that it shall beheld from m ovement while the bucket continues its movement for a few inches, and the trip be thereby released, the drum is provided with a brake surface-71,s and a brake 7114 is provided to co-operate with the brake surface under;

the influence of a pedal h5, mounted on a pedestal h6.

Whenever the engineer desires to discharge the load from the bucket, he applies his 'foot to the pedal which is conveniently placed before him and thereby stops the rotation of vthe drum under the influence of the outwardly moving trip rope and checks 4 the trip rope against further movement, whereby the`trip'is released and the load discharged just as the bucket is brought to rest under the Acontrol of the engineer.

It will be understood that various changes in details of construction and arrangement can be made to suit different conditions of use and the convenience of the manufacturer,

and that the invention, therefore, is not limited to the particular construction shown and described herein except as pointed out in the claims. V

'I claim as my invention: I

1. In an excavator the combination of a bucket provided with a discharging trip,

means to support the bucket for movement,l

means to move the bucket on itssupport, a trip rope connected to the trip, a'drum to which the trip rope is connected and wound connected'to` the drum and wound thereon infthe opposite direction, and means to check the rotation of the drum.

In an excavator, the combination of a bucket. provided with a discharging trip,

' means to support the/bucket for movement,

means to move the bucket on its support, a trip rope connected to the trip, a drum to whichl the trip rope is connected and wound in one direction thereon, a take-up rope also connected to the drum and wound thereon in the opposite direction, and a brake to check the rotation of the drum. This specification signed this 27th d y of Ju1y,A. D. 1921; 1

l' DAVD DE SANTO.

in one direction thereon, a take-up rope also 

